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from abc import ABC
from typing import Union
import pyarrow as pa
from feast import RepoConfig
from feast.infra.common.materialization_job import (
MaterializationJob,
MaterializationTask,
)
from feast.infra.common.retrieval_task import HistoricalRetrievalTask
from feast.infra.compute_engines.dag.context import ColumnInfo, ExecutionContext
from feast.infra.offline_stores.offline_store import OfflineStore
from feast.infra.online_stores.online_store import OnlineStore
from feast.infra.registry.registry import Registry
from feast.utils import _get_column_names
class ComputeEngine(ABC):
"""
The interface that Feast uses to control the compute system that handles materialization and get_historical_features.
Each engine must implement:
- materialize(): to generate and persist features
- get_historical_features(): to perform point-in-time correct joins
Engines should use FeatureBuilder and DAGNode abstractions to build modular, pluggable workflows.
"""
def __init__(
self,
*,
registry: Registry,
repo_config: RepoConfig,
offline_store: OfflineStore,
online_store: OnlineStore,
**kwargs,
):
self.registry = registry
self.repo_config = repo_config
self.offline_store = offline_store
self.online_store = online_store
def materialize(self, task: MaterializationTask) -> MaterializationJob:
raise NotImplementedError
def get_historical_features(self, task: HistoricalRetrievalTask) -> pa.Table:
raise NotImplementedError
def get_execution_context(
self,
task: Union[MaterializationTask, HistoricalRetrievalTask],
) -> ExecutionContext:
entity_defs = [
self.registry.get_entity(name, task.project)
for name in task.feature_view.entities
]
entity_df = None
if hasattr(task, "entity_df") and task.entity_df is not None:
entity_df = task.entity_df
column_info = self.get_column_info(task)
return ExecutionContext(
project=task.project,
repo_config=self.repo_config,
offline_store=self.offline_store,
online_store=self.online_store,
entity_defs=entity_defs,
column_info=column_info,
entity_df=entity_df,
)
def get_column_info(
self,
task: Union[MaterializationTask, HistoricalRetrievalTask],
) -> ColumnInfo:
join_keys, feature_cols, ts_col, created_ts_col = _get_column_names(
task.feature_view, self.registry.list_entities(task.project)
)
return ColumnInfo(
join_keys=join_keys,
feature_cols=feature_cols,
ts_col=ts_col,
created_ts_col=created_ts_col,
)